<overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
  <script>
    if (document.getElementById("testnode")) {
      document.loadOverlay(window.location.href.substr(0,window.location.href.lastIndexOf('/')+1)+'509719-2-overlay.xul', null);
    }
  </script>
  <box xmlns="http://www.w3.org/1999/xhtml" id="testnode" removeelement="true"/>
</overlay>
